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Surface Acoustic Waves in Inhomogeneous Media covers almost all important problems of the interaction of different types of surface acoustic waves with surface inhomogeneities. The problems of surface acoustic wave interaction with periodic topographic gratings widely used in filters and resonators are under careful consideration. The most important results of surface wave scattering by local defects such as grooves, random roughness, elastic wedges are given. Different theoretical approaches and practical rules for solving the surface wave problems are presented.
This book presents the theory of waves and oscillations and various applications of acoustics in a logical and simple form. The physical principles have been explained with necessary mathematical formulation and supported by experimental layout wherever possible. Incorporating the classical view point all aspects of acoustic waves and oscillations have been discussed together with detailed elaboration of modern technological applications of sound. A separate chapter on ultrasonics emphasises the importance of this branch of science in fundamental and applied research. The book is expected to present to its readers a comprehensive presentation of the subject-matter and at the same time to guide him for independent thinking on some new lines of investigation.
There is no respect for mere age in Science or Technology. Yet the cen tenary of the discovery, by the third Lord Rayleigh, that elastic waves can be guided by a surface, is memorable for the contradictions which it encompasses: Rayleigh's assessment of his classic 1885 paper as a rather minor mathematical development with a potential value only in seismology on the one hand; on the other the rediscovery of the subject in a totally that of electronic signal processing - which has led to its different fiel- explosive growth over the last twenty years. The new surface acoustic wave (SAW) devices have proved to be per electronic components. Today almost all television receivers con vasive tain one or more SAW filters, sophisticated radars depend on SAW signal processing, and SAW devices have been incorporated in ultra-high perfor mance opto-electronic systems. With the objective of surveying these developments and attempting to predict those that can be foreseen, as well as marking the centenary of Lord Rayleigh's discovery, The Rank Prize Funds' Committee for Opto Electronics organised a symposium in London, in July 1985. It was held in the Royal Institution, London, where Rayleigh himself once worked and often lectured. The present volume is the tangible outcome of the symposium, In which international experts survey.ed their various fields, and presented the most exciting recent developments.
This work is to explore the time-reversal symmetry breaking employing an acoustic wave platform through space-time parametric modulations, for the purpose of developing nonlinear devices such as amplifiers and mixers. The strength of acoustic wave platform is that it can obtain great leverage on the slow velocity and small wavelength of acoustic waves at RF to minimize the footprint of transmission lines. To realize parametric amplification, nonlinear Surface Acoustic Wave(SAW) grating is employed to pump a dynamic biasing electric field into the piezoelectric material to couple the pump electromagnetic wave to the propagating surface acoustic waves in the condition of phase matched. Two different ways to achieve nonlinear change of piezoelectric coefficient and elastic stiffness are proposed: 1) Material nonlinearity using ferromagnetic material like BST; 2) Geometrical nonlinearity using the coupling between vertical and parallel stiffness. The fractional modulation of elastic stiffness is approximate 4% in the first approach and can reach 10% or even higher in the second approach. Simulation validation using COMSOL demonstrates the parametric fixing effects produced on the Surface Acoustic Wave devices. Fabrication and characterization of Surface Acoustic Wave delay lines are also provided.